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Old 12-31-2014, 08:55 AM
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Anyone install the OEM tow wiring harness themselves?

Hey guys,

Searched all over the forum and youtube for anyone that has had to install the OEM tow wiring harness for a WK2 Jeep GC, mine is a 2012. I've just finished up the OEM hitch install and even though i'm not going to use it for anything more then a bike rack, cargo hauler, etc. i'd like to fill in the hole to the left of the receiver and also wire it up just in case i do get a utility trailer. Anyone actually do this themselves and if so how was it? I've downloaded the instructions which don't appear to too much of a hassle and I do enjoy doing my own work however if its more trouble then I think i'll have the dealer do it. Any feeback on this install would def help me make a decision, thx!

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Old 01-02-2015, 06:36 AM
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Re: Anyone install the OEM tow wiring harness themselves?

Not bad at all. A few wiring taps are needed at the TIPM. Running the wiring under the vehicle is quite easy. The only wire that will pass through the firewall is the light blue signal wire for the electric trailer brakes however, it won't need to be connected if you don't plan to pull a trailer which has electric brakes.

The only downfall to installing the harness yourself is that you will need to take your Jeep to the dealer to have them electronically activate the towing circuit.
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Old 01-02-2015, 04:10 PM
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Re: Anyone install the OEM tow wiring harness themselves?

Great to hear and thx for the input. I should be getting the harness in the next day or two and wanted to get some sort of insight on how hard/easy this was. Sounds like its doable for a DIY'er. Amazing how many tow hitch posts there are but non of them had/have any detail on the wiring. At least if I can do this myself i'll feel better about swallowing a $40 charge to have someone plug in a scan tool and hit a button to activate the plug.
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Old 01-03-2015, 08:36 AM
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Re: Anyone install the OEM tow wiring harness themselves?

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Originally Posted by loue37 View Post
Great to hear and thx for the input. I should be getting the harness in the next day or two and wanted to get some sort of insight on how hard/easy this was. Sounds like its doable for a DIY'er. Amazing how many tow hitch posts there are but non of them had/have any detail on the wiring. At least if I can do this myself i'll feel better about swallowing a $40 charge to have someone plug in a scan tool and hit a button to activate the plug.
I would say the main reason nobody talks about the wiring is that most of us found the wiring already in place. There was a plug tucked up in the rear bumper on the driver's side. All I had to do was plug into it and then have it activated. I was going to reply to your original post, but saw that you installed the hitch yourself and it would be pretty tough not to notice the wiring if it was there.
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Old 01-03-2015, 03:02 PM
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Re: Anyone install the OEM tow wiring harness themselves?

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Originally Posted by FreeJersey View Post
... All I had to do was plug into it and then have it activated. ...
Did you get the dealer to do it? How much did they charge to change the setting? thx
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Old 01-03-2015, 04:03 PM
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Re: Anyone install the OEM tow wiring harness themselves?

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Originally Posted by BarryB View Post
Did you get the dealer to do it? How much did they charge to change the setting? thx
I called 3 dealers, they all gave me the same price. $60. So I had it done at the closest dealer to my house when I got my last free oil change.
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Old 01-05-2015, 06:43 PM
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Re: Anyone install the OEM tow wiring harness themselves?

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Originally Posted by FreeJersey View Post
I called 3 dealers, they all gave me the same price. $60. So I had it done at the closest dealer to my house when I got my last free oil change.

Great - thx.
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Old 01-23-2015, 07:03 AM
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Smile Re: Anyone install the OEM tow wiring harness themselves?

I also installed the OEM hitch and plug outlet on my 12 Laredo, and my luck being as it is the factory wiring harness was not there. So after thinking it over and comparing the cost I decided to go with the tail lite adapter kit that allows you to connect at the tail light housing. The only problem was the connector socket at the rear of the OEM dual plug outlet. I found a small harness at Etrailers. com that had this connector on the one end. I just had to do a cut and splice to make it work. I only pull a boat and sometimes a utility trailer so the E brake wire is not needed. This works great and a dealer flash is not required.
If anyone would also want to go this route here are the part # 118384 and 118425.
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Old 04-24-2015, 06:44 PM
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Re: Anyone install the OEM tow wiring harness themselves?

Just in the process of doing this myself. Found the instruction to be a little lacking in a couple points. the routing through the engine cavity is pretty vague. It just states to stay as far away possible from the exhaust. Where did you guys run it? I find the other spot available pretty close to the front passenger drive shaft. Also I started routing the cable from the hitch end. The hitch connector is way larger than the TIPM end, so this made routing through some of those nook & crannys a bit easier.
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